Anna Borghesani

A 135-km 8192-Split Carrier Distributed DWDM-TDMA PON With 2

We present a hybrid dense wavelength-division-multiplexed time-division multiple access passive optical network (DWDM-TDMA PON) with record performance in terms of reach (135.1 km of which 124 km were field-installed fibers), number of supported optical network units (ONUs-8192) and capacity (symmetric 320 Gb/s). This was done using 32-, 50-GHz-spaced downstream wavelengths and another 32-, 50-GHz-spaced upstream wavelengths, each carrying 10 Gb/s traffic (256 ONUs per wavelength, upstream operated in burst mode). The 10 Gb/s downstream channels were based upon DFB lasers (arranged in a DWDM grid), whose outputs were modulated using a electro-absorption modulator (EAM). The downstream channels were terminated using avalanche photodiodes in the optical networks units (ONUs). Erbium-doped fiber amplifiers (EDFAs) provided the gain to overcome the large fiber and splitting losses. The 10 Gb/s upstream channels were based upon seed carriers (arranged in a DWDM grid) distributed from the service node towards the optical network units (ONUs) located in the users premises. The ONUs boosted, modulated, and reflected these seed carriers back toward the service node using integrated 10 Gb/s reflective EAM-SOAs (EAM-semiconductor optical amplifier). This seed carrier distribution scheme offers the advantage that all wavelength referencing is done in the well-controlled environment of the service node. The bursty upstream channels were further supported by gain stabilized EDFAs and a 3R 10 Gb/s burst-mode receiver with electronic dispersion compensation. The demonstrated network concept allows integration of metro and optical access networks into a single all-optical system, which has potential for capital and operational expenditure savings for operators.

\,\times\,

We report on a hybrid DWDM-TDM A optical access network that provides a route for integrating access and metro net- works into a single all-optical system. The greatest challenge in using DWDM in optical access networks is to precisely align the wavelength of the customer transmitter (Tx) with a DWDM wave- length grid at low cost. Here, this was achieved using novel tunable, external cavity lasers in the optical network units (ONUs) at the customers end. To further support the upstream link, a 10 Gb/s burst mode receiver (BMRx) was developed and gain-stabilized erbium-doped fiber amplifiers (EDFAs) were used in the network experiments. The experimental results show that 10 Gb/s bit rates can be achieved both in the downstream and upstream (operated in burst mode) direction over a reach of 100 km. Up to 32 × 50 GHz spaced downstream wavelengths and another 32 × 50 GHz spaced upstream wavelengths can be supported. A 512 split per wave- length was achieved: the network is then capable of distributing a symmetric 320 Gb/s capacity to 16384 customers. The proposed architecture is a potential candidate for future optical access net- works. Indeed it spreads the cost of the network equipment over a very large customer base, allows for node consolidation and integration of metro and optical access networks into an all-optical system.

32

A DWDM-TDMA PON using carrier distribution with symmetric 320 Gb/s capacity is demonstrated over 124 km field-installed fibers. The upstream channels feature a 3R 10 Gb/s burst-mode receiver with electronic dispersion compensation, burst-mode EDFAs and integrated reflective SOA-EAMs.

\,\times\,

A novel integrated reflective EAM-SOA, capable of tolerating optical carrier power variations of up to 13dB, is operated in a 10Gb/s, 128-way split, 100km reach DWDM-TDMA PON.

10 Gb/s Capacity

State of the art semiconductor optical components, suitable for next generation Access network will be investigated, in particular focusing on their suitability for low cost, mass deployment networks.

Demonstration of a 32

With the increasing demand for bandwidth, there is an ever growing interest in fibre to the home (FTTH) technologies and its deployments. Wavelength division multiplexing passive optical networks (WDM-PONs) have received a lot of attention as one of the best contenders for next generation optical access networks. In this paper we will overview on WDM-PON architectures, focussing our attention on reflective PON schemes that offer a cost-effective, colourless solution. The critical component required for these schemes is the reflective semiconductor optical amplifier (RSOA) transmitter at the customer premises. This paper will report latest results on RSOA technology for WDM-PON.

\,\times\,

We present different types of semiconductor optical amplifier, each specifically optimised for a particular optical application. Especially, we focus our attention on which key device parameters are desirable for applications such as in-line optical amplification, or all-optical signal processing. We start from the device design characteristics, focussing on the challenges involved in making leading-edge semiconductor material. We then present a range of SOAs developed at CIP for specific applications, concentrating on the key features of each design. Finally, we, show results from several examples of advanced applications from booster amplification to non linear applications

512 Split, 100 km Reach, 2

A fully reconfigurable add/drop node for use in metro DWDM networks based on a novel switched reflective architecture is demonstrated. The scheme saves power and avoids the need for expensive tunable lasers on equipment cards.

\,\times\,

We demonstrate a DWDM-TDMA PON with symmetric 320 Gb/s capacity shared between 16384 customers. The upstream channels were tested in burst-mode and feature low-cost tuneable lasers, monolithically integrated SOA-EAMs, burst-mode EDFAs and a 10 Gb/s burst-mode receiver.

32

We present the first experimental demonstration of a bi-directional, reflective, electro-absorption transducer-based, 480 Mbps UWB-wireless/optical transmission system. A -21.4 dB error vector magnitude was observed over 1 km of single mode fibre.